Hi Sinevegas,
Don't get disheartened, I'm a born again gardener (I had no garden of my own for nearly 5 years.... long story!) but this is the 1st year I've grown any veg, everything was a bit late going in because of when we moved. We're on caly and we've had the same problem with the slugs and they wiped out my beetroot so I replanted and they are doing ok this time. I do confess to Organic slug pellets on the cells to give them a head start.
I've got containers which aren't very big, (old recycling boxes that have a bit of a crack in the bottom but don't tell the council!) with carrots just popping through, thought the depth might stop the carrot fly but we'll see! and we've just got some cheap clingfilm to go over them and stuck a couple of holes in in case it rains so it doesnt get weighted down. then we just roll it back on the roll when we're done.... ok sometimes we chuck it if its really squished up!
one thing I do know is that it feels great when you raise anything from seed, I've done herbs before, it's good for your soul!